I have a Western Digital 1.0 TB drive WD10EALS that I'm attempting to install as an external drive through a USB port. When plugged in, Windows XP said it found it and installed it. But, it is not accessible and not given a drive letter. I've tried Western Digital's Diagnostic and their Align programs and neither recognize it to work with it. How do I get it recognized or formatted, which ever I need done?